Defeating the gladiator...
	Extras...
	Three free codes...

To kill the gladiator, use Cole and continue to slow down time and shoot it in the back. This will require several attempts.

Extra	How to unlock
01 Cpt. Devin Ross	Kill 50 enemies using melee attacks
02 Lt. Abigail Black	Kill 50 enemies using Ghost Bullet
03 Sgt. Frank Delgado	Pop 50 heads!
04 Sgt. Wilhelmina "Billie" Church	Complete "Al Khali" on hard
05 Cpt. Xavier Jones	Complete "Man Down" on hard
06 Cpl. Simone Cole	Complete "The Tomb" on hard
07 Fr. Paul Rawlings	Pop 100 heads!
08 Agent Muriel Green	Complete "The Den of Souls" on hard
09 Arnold Leech	Complete "Al Khali" on either easy or normal
10 Deceased Devin Ross	Complete "Still With You" on hard
11 Cultist	Kill 100 enemies using melee attacks
12 Exlposive Cultist	Disintegrate 50 enemies!
15 Corpses Behemoth	Complete "River of Blood" on hard
17 Psychic Commander	Complete "World War 2" on either easy or normal
19 Flamethrower	Disintegrate 100 enemies!
20 Grenadier	Kill 100 enemies using Ghost Bullet
21 Sir Richard de Gray	Complete "Out of the Frying Pan" on hard
22 Brother William of Auxere	Complete "Motley Crew" on hard
23 Warrior Crusader	Complete "Sewers" on hard
24 Crossbowman Crusader	Complete "Tortured Souls" on hard
25 Child Crusader	Complete "Crusades" on either easy or normal
26 Bishop Malthus St. Claire	Complete "Crusades" on either easy or normal
27 Centurion Textius Longinus	Complete "Decadence" on hard without being incapacitated
28 Governor Cassus Vicus	Complete "Rome"on either easy or normal
29 Legionary	Complete "The Low Road" on hard
30 Blind Behemoth	Complete "Morituri te salutant" on hard without being incapacitated
31 Gladiator	Complete "Temple of Pain" on hard
32 Antadurunnu	Complete "The God Seal" on hard
33 Enlil	Complete "Spiritual Guide" on hard
34 Inanna	Complete "Skin" on hard
35 Ki	Complete "Flesh" on hard
36 Ninlil	Complete "Skin" on hard without being incapacitated
37 Nanna	Complete "Blood" on hard
38 Utu	Complete "Blood" on hard without being incapacitated
39 Sumerian Puppet	Complete "Flesh" on hard without being incapacitated
40 Pyxis Prima	Complete "Sumeria" on either easy or normal
42 The Jericho Team	Complete "Rivers of Blood" on hard without being incapacitated
43 Operation: Godseal	Complete "Exorcism" on hard

Although the game's cheat codes are encrypted and are unique to your specific disc access code, you can get receive three free codes by using the following trick. First, make a note of the five digit access code that is unique to your disc by looking at the top of the "Bonus Codes" screen. Then, go to the game's pre-order website http://www.codemasters.com/jerichopreorder/index.php?shop=gamestop and enter "AGEH-56JW-X2GB-DN1N-EGUT" as a pre-order code. Then, enter your five digit code, select your game system, and click "Submit". The cheat codes for the "Unlimited Ammo" and "Fast Health Regeneration" options will be displayed for your game. Next, go to to www.codemasters.com. Sign up for a free account and log in. Go to their registration page http://www.codemasters.com/register/ and register your game to get the cheat code for the "Dominator Damage" option.